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Long-Term Debt - Senior Notes (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Nov. 06, 2019
Nov. 06, 2018
Details for the Senior Notes          
Long-term debt $ 952,756,000   $ 589,294,000    
Senior Notes | 6.125% Senior Notes          
Debt Instrument [Line Items]          
Stated interest rate         6.125%
Debt price level       98.937%  
Debt instrument yield       6.375%  
Debt instrument face amount         $ 550,000,000.0
Details for the Senior Notes          
6.125% Senior Notes principal balance 550,000,000   550,000,000    
Less: Debt issue cost 4,651,000   4,972,000    
Less: debt discount 4,380,000   4,651,000    
Long-term debt 540,969,000   $ 540,377,000    
Interest Expense and Amortization of Debt Issue Costs          
Interest expense 8,693,000 $ 8,676,000      
Unused facility fee 321,000 319,000      
Debt discount amortization 271,000 254,000      
Interest Expense $ 9,285,000 $ 9,249,000